Sulfur dye and process of making same.



solution (or 252 grams ofNa s crvst-als incold-Water, cold caustic alkaline oralkali 5 Brion.

- EDIWARD scHAPIN, OF NEW YORK, N. Y.

fisuL'FUn DYE AND PROCESS or MAKING SAME.

To all whom it may concern: v Be it known that I, EDWARD S. CHAPIN, a citizen of the -United States, residing} in the borough of Brooklyn, city and State of New York, have invented a new and useful Improvement in Sulfur Colors and Process of Making the Same, of which the folloW- ing is aspecification. N I I have found that by heating a mixture of' copper sulfate, sulfur, sodium sulfid and one of a number of various members of the chemical group denominated carbohydrates I have obtained new coloring matters. These new coloring matters are par ticularly fast to light and to Washing.

Example: 126 grams of Na s (Gone) and 126 grains of rate are heated together to may be heated instead) T8 gra1ns of sulfur are thendisstilvedjin this solution. The solution is alloired'to cool,v and 90 grams of starch are adltled. Then lS grams, of copper sulfate crystals (bluestone) dissolved inBO' cubic centimeters of 'ater are added to com plete the components of the melt; The mass is then heated su'fiiciently to drive off the water; the temperature is then raised to 140 C. and maintained at that point for ayd 190. C. and maintained at that point for another hour, or until thelfull.tinctorialv power of the color has been developed.

The resulting product is readily soluble Specification of Letters Patent. Application filed Febniasy 6 1907. Serial No.- 355,989.

si 'ned my carbonate solution, and dyes cotton in an- Renewed September 24, 1908. 'iseria sm %540.

alkaline salt bath fast olive brown black shades.

The color produced by this dyestul'f' differs fron'ithatof the substance which'would be formed without the useof the copper sulfate. This new dyestuff isespecially s1'1- perior in fastness to light 'to that formed without the use of the.copper sulfate. .If other carbohydrates, such as grape sugar or gum 'arabio be substituted for starch, analogous products will belobtained,

, I claim:

1. Theprocess of-making'dyestuifs consisting in heating" together a carbohydrate, sulfur, sodium sulfid and copper-sulfate substantially as. described.

i.. The processof making dyestuffs consisting in heatingtogether starch, sulfur,

sodium sulfid and copper sulfate, substan tially as described.

3. As a newarticle of'manufact'ure the ,dyestulf obtained by heating starch, sulfur, sodium sulfid and copper sulfate n substantially the manner hereln before speclfiedQwhich is readily soluble in cold Water, cold caustic alkaline or alkali carbonate'solut1on, and dyes cotton. in an alkahne salt bath fast olive brown black shades. one hour; it is then raised to between 180,

In testimony whereof have hereunto n 'name in the presence of two subscribing-'\\'itnesses. v

'EDVARD S. GHAPIN; Witnesses FRITZ v. BRIESEN, Jorm A. KnHLi'JNBEoK. 

